Using HANA SQL Functions in select list of CDS Views

Dear Expert,

Kindly please let me know if we can use the HANA SQL Function (Ex: ADD_DAYS, SECONDS_BETWEEN) in the select list of CDS Views?

If I create a CDS like below I get error that timestamp is not supported.

For Example:

@AbapCatalog.sqlViewName: 'ZMR_H_CA'

@EndUserText.label: 'CAG A'

define view viewname

with parameters start_ts:abap.dec( 15, 0 ) , end_ts:abap.dec( 15, 0 )

as select from table {

key resource_key,

TO_TIMESTAMP(begtstmp) as start_tmp,

TO_TIMESTAMP(begtstmp) as end_tmp

}

where

(begtstmp > $parameters.start_ts or endtstmp > $parameters.start_ts )

and

(begtstmp < $parameters.end_ts or endtstmp < $parameters.end_ts )

Thanks,

Giri